Enable Ruff ANN2 (flake8-annotations, autofixes only) (python#13331)

pyproject.toml

@@ -50,6 +50,8 @@ select = [
     "E", # pycodestyle Error
     "F", # Pyflakes
     "W", # pycodestyle Warning
+    # Only include flake8-annotations rules that are autofixable. Otherwise leave this to mypy+pyright
+    "ANN2",
     # Most refurb rules are in preview and can be opinionated,
     # consider them individually as they come out of preview (last check: 0.8.4)
     "FURB105", # Unnecessary empty string passed to `print`
@@ -114,11 +116,9 @@ ignore = [
 
 [tool.ruff.lint.per-file-ignores]
 "*.pyi" = [
-    # Ruff 0.8.0 added sorting of __all__ and __slots_.
-    # There is no consensus on whether we want to apply this to stubs, so keeping the status quo.
-    # See https://github.com/python/typeshed/pull/13108
-    "RUF022",
-    "RUF023",
+    # A lot of stubs are incomplete on purpose, and that's configured through pyright
+    # Some ANN204 (special method) are autofixable in stubs, but not all.
+    "ANN2", # Missing return type annotation for ...
     # Most pep8-naming rules don't apply for third-party stubs like typeshed.
     # N811 to N814 could apply, but we often use them to disambiguate a name whilst making it look like a more common one
     "N8",
@@ -127,6 +127,11 @@ ignore = [
     # Stubs can sometimes re-export entire modules.
     # Issues with using a star-imported name will be caught by type-checkers.
     "F405", # may be undefined, or defined from star imports
+    # Ruff 0.8.0 added sorting of __all__ and __slots_.
+    # There is no consensus on whether we want to apply this to stubs, so keeping the status quo.
+    # See https://github.com/python/typeshed/pull/13108
+    "RUF022",
+    "RUF023",
 ]
 # See comment on black's force-exclude config above
 "*_pb2.pyi" = [